The CAS Registry Mumber 88127-63-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,8,1,2 and 7 respectively; the second part has 2 digits, 6 and 3 respectively. Calculate Digit Verification of CAS Registry Number 88127-63: (7*8)+(6*8)+(5*1)+(4*2)+(3*7)+(2*6)+(1*3)=153 153 % 10 = 3 So 88127-63-3 is a valid CAS Registry Number.